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Vegetable insulating oil, characterized by high ignition point, environmental friendliness, renewability, and biodegradability, serves as a promising alternative to mineral oil in power transformers. This study investigates aging effects on the frequency-domain dielectric properties of vegetable oil-impregnated insulation paper. First, a C–C model-based separation method for conductivity and polarization losses in dielectric response measurements is proposed. Then, aged samples are prepared, losses separated, and aging effects analyzed. Finally, functional relationships between integral loss parameters and aging degree are established, demonstrating high fitting goodness.

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Evaluation of the Aging State of Vegetable Oil Paper Insulation Based on the Imaginary Part of the Complex Dielectric Constant

  • 会议论文

  • 发表日期：

    2026年

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  • Chunyi Liu,
  • Dong Chen,
  • Jin Zhang,
  • Muqian He,
  • Min Chen,
  • Li Zhi,
  • Yuanxi Liu

摘要

Vegetable insulating oil, characterized by high ignition point, environmental friendliness, renewability, and biodegradability, serves as a promising alternative to mineral oil in power transformers. This study investigates aging effects on the frequency-domain dielectric properties of vegetable oil-impregnated insulation paper. First, a C–C model-based separation method for conductivity and polarization losses in dielectric response measurements is proposed. Then, aged samples are prepared, losses separated, and aging effects analyzed. Finally, functional relationships between integral loss parameters and aging degree are established, demonstrating high fitting goodness.